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(No Model.) '3 SheetS Sheet 1. W. O. VIVARTTAS.

GRINDING MACHINE.

bio/563,105. Patented June so, 1896.

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I 'W. O. VIVARTTAS.

GRINDING MACHINE.

No. 563,105. Patented June 30, 1896.

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AN DREW EGHAHAM. PHOTO UTHO WASHINGTUNYDC (No Model.) 3 SheetsSheet 3.

W. O. VIVARTTAS.

GRINDING MACHINE. No. 563,105. Patented June 30, 1896.

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UNITED STATES PATENT OFFICE.

IVILLIAM O. VIVARTTAS, OF HOBOKEN, NElV JERSEY, ASSIGNOR TO THE GLEN OOVE MACHINE OOMPANY,-LIMITED, OF NEYV YORK, N. Y.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 563,105, dated June 30,1896.

Application filed, November 4, 1895- Serial NO. 567,796- (No model.)

To (bl Z whmn it may concern:

Be it known that I, WILLIAM 'O.V1vARTrAs, of Hoboken, in the county ofHudson and State of New Jersey, have invented a new and usefulImprovement in Grinding-Machines, of which the following is aspecification.

My invention relates to an improvement in grinding-machines, and moreparticularly to machines for automatically grinding edges ofcutting-knives, either straight or curved.

In the accompanying drawings, Figure l is a view of the machine in frontelevation. Fig. 2 is a View in vertical section from front to rear. Fig.3 is a view in detail in vertical section taken transversely through themachine in the plane of line 00 a: of Fig. 2. Fig. 4 is a horizontalsection taken along the plane of the line y y of Fig. '2, and Fig. 5 isa View in detail of the head on which the knife is supported while beingground.

The supporting-frame of the'machine 0on sists of a base or pedestal A,spreading out laterally at its upper portion, as shown at a, to form anextended way for the travel of the carriage which, in the present formof my invention, carries the knife to be ground back and forth past theperiphery of the grinding stone while the latter is caused to rotate ina vertical plane and positively and automatically fed toward the surfaceto be ground.

The main drive-shaft (denoted by B) is mounted within sleeves or hollowtrunnions b, which latter are supported in suitable openings in arearward projection of the pedestal A. On the sleeves or hollowtrunnions 1) arms I) b are mounted and extend upwardly into position tosupport the grindingstone 0 at the proper height. The stone C is fixedto a shaft 0, mounted in suitable bearings at the upper ends of the arms(2 b and said shaft is provided with a drive-pulley c, which isconnected by a belt 0 with a drivepulley b on the main shaft B.

The grindstone O is surrounded by a casing 0 spaced a short distancefrom its periphery and widened opposite the hub portion of thegrindstone', as shown at 0 This casing c is provided with elongatedslots 0 where the shaft cpasses through the casing to permit the wheelto be rocked with its supportingarms toward and away from the work. The

casing c is fixed to the upper portion of the pedestal A. The arms b bare connected at points below the casing by cross-girders o b.

On the top of the pedestal A, along the upper edge of the extendedportion a, there is formed a dovetailed way, on which a carriage D isfitted to slide. The carriage D has fixed to its under side a rack-barcl in position to be engaged by a spur-wheel, as will be hereinafterparticularly described. The carriage I) has a U-shaped frame E pivotedbetween uprising arms d of the carriage, and between the branches e ofthe U-shaped frame E-the head or work-holder F is mounted for theattachment thereto of the knife to be ground. One side f of the head Fis made winding and provided with a central longitudinal groove f andwith a winding rib f having the samewind as the face f, for the purposeof guiding the head in such a manner as to present the edge throughoutits en tire length in the same position relative to the grinding-stone.Another side of the head F is made straight, and is denoted by f for thegrinding of the straight knife, and it also has a projecting rib f forholding it truly to the stone.

A yielding plunger G is mounted in a socket-piece I-I, supported by thecasing just above the opening through which the supporting-head F entersthe casing to bring the knife into contact with the stone. The lower endof said plunger G is provided with a winding groove g to fit theguide-rib f and also with a straight groove g, ext-ending transverselyto the groove 9 for receiving the rib f when grinding a straight knife.The plunger G is held in engagement with the rib by a spring g engagedwith the upper end of the wall of the socket-piece H and with a shoulderon the plunger, and the plunger is lifted and held out of engagementwith the guide-rib by means of a lever 9 pivoted to the upper end of theplunger at 9 so that when rocked upwardly it will lift the plunger andat the same time swing its rounded end g into position between thepivotal point g and the head of the socket-piece H, thereby holding theplunger in elevated adjustment.

The U-shaped swinging support E has a nose e formedat its front, so thatwhen it is swung forwardly for the purpose of adjusting a newknife-blade to the supporting-head, the nose 6 will engage the top ofthe carriage and prevent it from swinging beyond a predetermined point.The adjustment of the U- shaped frame E, when swung into its positionfor use, is effected by means of a set-screw 6 extending through ascrew-threaded perforation in alug e projecting rearwardly from theframe E and engaging the top of the carriage D.

The carriage is adjusted to its way by means of set-screws which extendthrough a depending flange of the carriage at its front and engages awearing-shoe d in contact with the beveled face of the way.

A worm-shaft I, extending transversely of the machine, is provided witha pulley i, fixed to rotate with the shaft and with loose pulleys t" andt upon opposite sides of the pulley i. A belt K and a cross-belt Kconnect two of the pulleys i z" i with the driving-pulley 7c, fixed torotate with the drive-shaft B. The arrangement of the belts K K is suchthat one of them, for example K, may be engaged with the pulley 1: andthe drive-pulley 7a to rotate the worm-shaft I in one direction, whilethe cross-belt K runs idly upon the loose pulley t and when it isdesired to rotate the worm-shaft Iin the opposite direction the belt Kmay be shifted onto the loose pulley t" and the cross-belt K may beshifted onto the pulley t'. A belt-shifter, consisting of a sliding barL, provided with sets of jaws Z Z, is employed for simultaneouslyshifting the two belts K K to rotate the worm-shaft in the one directionor the other.

The worm on the shaft I is arranged to engage a worm-wheel M, looselymounted on a sleeve at, which is supported upon a shaft N, extendingfrom front to rear of the machine and mounted in suitable bearings inthe supporting-frame. On the same sleeve n on which the worm-wheel M ismounted there is also mounted a spur-wheel m in gear with the rack-bar(Z on the under side of the carriage D. Provision is made for slidingthe spur-wheel on along the sleeve 11 toward and away from theworm-wheel M to clutch it to and release it from the worm-wheel in orderto operate the carriage on its way or to throw it out of operativeposition. The shifting mechanism for throwing the spur-wheel m into andout of engagement with the worm-wheel consists of a lever 0, supportedat its lower end at the front of the pedestal A, as shown at 0, with itsfree'end in loose engagement with the hub of the spur-wheel m. Thelever-operating rod 0 is engaged at one end with the lever O and extendsat its opposite end through the front of the pedestal, where it isprovided with an operating-handle o pivoted to its end in such a mannerthat when the operatinghandle 0 is thrown upwardly it will draw the rod0 forwardly against the tension of the interposed spring 0 and by theengagement of the end of the operating-handle 0 with the front of thepedestal will lock the shiftinglever O in its forward adjustment againstthe tension of the spring 0 and hence the spurwheel m out of engagementwith the wormwheel M, and so cause the carriage D to stop its travel.

The shaft N is provided at its rear end with a screw-threaded portion a,which works in a nut P, secured between a pair of rocking arms p,pivotedto a pair of lugs p on the cross-girder As the shaft N is held againstlongitudinal movement its rotary movement will tend, by the engagementof its screw-threaded portion with the nut P, to draw thegrindstone-snpporting arms toward or push them away from the front ofthe machine or toward and away from the work on the supportinghead F,according as it is rotated in the one direction or the other.

On the sleeve it there is also loosely mounted a three-armed wheel Q,the depending arm q being connected by a rod q with a connecting-piece gon the sliding belt-shifter L, and the upwardly-extendin g arm gextending into the path of pins R and R, which may be inserted in any ofthe several holes r through the side of the carriage D. The third arm qof the three-armed wheel has an adjustable connection g with an arm 8 ona short rockshaft S, journaled in a suitable hearing at the front of theupper portion of the supportingframe, which shaft S has also fixedthereto, at the front of the frame, an arm s, engaged with a set ofgripping-jaws T by alink The gripping-jaws T are adapted to embrace therim to of a wheel U, fixed to rotate with the shaft N at the front ofthe supporting-frame. The wheel U is provided with a series ofperforations it for receiving a pin 1L which pin is arranged to engage aprojection t on the gripping-jaws T when the wheel U has been rotated ina position to bring the pin a into proximity to the jaws. Power maybeapplied to and released from the drive-shaft B by means of adrive-pulley B and a loose pulley B from any suitable source.

The operation is as follows: Suppose the blade, either the curved bladeor straight blade, to have been placed upon the supporting-head F andthe guide G adjusted to the supporting-head, the carriage for traversingthe blade back and forth against the periphery of the grinding-stone isset in motion by throwing the spur-wheel on into engagement with theworm-wheel M. The pins R and R having been inserted in the holes 1' inthe carriage at such distances apart as to correspond to the length ofthe blade to be ground, as the carriage in traveling in the direction inwhich it was started brings one of the pins R B into engagement with theupwardlyextending arm g of the three-armed wheel Q, it will rock saidwheel Q, and will, by means of the connection of its depending arm qwith the beltshifter L, shift the belts K K to rotate the worm-shaft inthe opposite direction and hence start the carriage on its return moveaction may be made to automatically stop ment. As the carriageapproaches the limit of its stroke on its return movement, the other pinR or R will, in like manner, rock the three-armed wheel Q in theopposite direction and will again shift the belts K K, so as to causethe carriage to again advance in the opposite direction, and in thismanner the carriage will continue to be automatically reciprocated backand forth across the periphery of the grindstone until the spur-wheel mhas been thrown out of engagement with the Worm-wheel M. As thethree-armed wheel Q is rocked in the direction to lower the arm q itwill, by its connection with the arm 5 on the rock S, lower the arm 8and thereby slide the gripping-jaws T loosely along the rim u of thewheel U. When the three-armed wheel is rocked in the opposite direction,the arm by lifting, will carry with it the arm 5 and hence the arm .9and the gripping-jaws T, connected therewith, which, by the linkconnection 8 will be caused to grip tightly the rim u and thereby rotatethe wheel U in the direction in which the hands of a clock travel. Thismovement of the wheel U will rotate the shaft N and by its engagementwith the nut v P will feed the grindstone forward toward its work. Thisforwardly feeding of the grindstone may be arrested at any predeterminedinterval by inserting a pin a in one of the holes a at a greater or lessdistance from the gripping-jaws T, so that the said pin will arrest thedownwardly sliding movement of said jaws along the rim of the wheel Uwhen the shaft S is rocked by the movement of the three-armed wheel andhence will prevent it from catching a new hold of the rim to rotate thewheel U. By this provision the grinding after a predetermined amount hasbeen ground from the blade or other work presented to the grindstone,even though the attendant be absent and fail to stop the travel of thecarriage.

It is obvious that slight changes might be resorted to in the form andarrangement of the several parts without departing from the spirit andscope of my invention. Hence I do not wish to limit myself strictly tothe structure herein set forth; but

lVhatI claim is- 1. A grinding-machine, comprising a grindstone, meansfor rotating it, a rotary workholder, a reciprocating carriage forming asupport for the work-holder, means for reciprocating the carriage, aguide for determining the rotary movement of the work-holder while it isbeing reciprocated, a feed mechanism under the control of thereciprocating carriage to cause the grindstone to approach the work andmeans for automatically stopping the feed at a predetermined point inits travel, substantially as set forth.

stone, means for rotating it, a rotary workholder, a swinging frameforming a support for the work-holder, a reciprocating carriage forminga support for the swinging frame, a guide for determining the amount ofrotation of the work-holder during its reciprocating movement and meansfor automatically reversing the movement of the carriage, substantiallyas set forth.

3. A grinding-machine, comprising a grindstone, means for rotating it, arotary workholder, a carriage forming a support for the work-holder, aguide for determining the amount of rotation of the work-holder duringits reciprocating movement, a rack-bar on the carriage, a spur-wheelmounted in position to engage the rack-bar, a worm-wheel, means forlocking the spur-wheel to and releasing it from the Worm-wheel, a wormfor operating the worm-wheel, a direct and a cross belt connectingpulleys on the drive-shaft and worm-shaft, and means under the controlof the carriage for shifting the said belts to reverse the worm-shaftand hence the carriage, substantially as set forth.

4:. A grinding-machine, comprisinga grindstone, a swinging support forthe grindstone, a rotary shaft provided with a screw-thread, a nutconnected with the swinging grindstonesupport and adapted to engage thescrewthreaded portion of the said shaft, a reciprocating carriage, awork-holder supported by the carriage, means for reciprocating thecarriage, a wheel fixed to rotate with said shaft, a clamp engaged withthe rim of said wheel, and means under the control of the reciprocatingcarriage for operating the clamp and thereby rotating the wheel and itsshaft to swing the grindstone toward its work, substantially as setforth.

5. In combination, a drive-shaft, sleeves or trunnions in which thedrive-shaft is mounted, a grindstone, a swinging grindstone-supportmounted on said sleeve or trunnions, a workholder, means forreciprocating the workholder transversely to the plane of thegrindstone, means for automatically swinging the grindstone toward itswork, and means for rotating the grindstone, substantially as set forth.

6. The combination with a grindstone, its support and means for rotatingit, of a casing for protecting the grindstone, a workholder, means forswinging the work-holder through an opening in the casing into proximityto the grindstone, and a plunger supported by the casing and fitted toengage the work-holder and guide it, substantially as set forth.

WILLIAM O. VIVARTTAS.

lVitnesses:

FREDK. HAYNES,

A grinding-machine, comprising a grind- IRENE B. DECKER.

